Establishing the Golden Range of Seebeck Coefficient for Maximizing Thermoelectric Performance

Hong, Min and Lyu, Wangyu and Wang, Yuan and Zou, Jin and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2020) Establishing the Golden Range of Seebeck Coefficient for Maximizing Thermoelectric Performance. Journal of the American Chemical Society, 142 (5). pp. 2672-2681. ISSN 0002-7863


Abstract

The coupling nature of thermoelectric properties determines that optimizing the Fermi level is the priority to achieve a net increase in thermoelectric performance. Conventionally, the carrier concentration is used as the reflection of the Fermi level in the band structure. However, carrier concentration strongly depends upon the material’s effective mass, leading to that the optimal carrier concentration varies over a large scale for different materials. Herein, inspired by the big data survey, we develop a golden Seebeck coefficient range of 202–230 μV K–1 for thermoelectric semiconductors with lattice thermal conductivity of 0.4–1.5 W m–1 K–1. When the measured Seebeck coefficient reaches this range, the corresponding figure of merit is maximized. Using this approach, we exemplarily analyze the characteristics of n-type Pb1–xBixSe thermoelectric materials. With detailed electron microscopy and property characterizations, the high densities of dislocations and pores are found to be responsible for a low lattice thermal conductivity. Moreover, Bi substitution significantly tunes the Seebeck coefficient in a wide range. As a result, the Seebeck coefficient of ∼ –230 μV K–1 in Pb0.98Bi0.02Se is close to the golden range, leading to a figure of merit beyond 1.5. This finding provides an intuitive metric to determine the optimization extent of thermoelectric performance.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 27 Jan 2021 01:49
Last Modified: 29 Jan 2021 04:36
Uncontrolled Keywords: Effective mass; Figure of merits; Lattice thermal conductivity; Property characterizations; Thermo-Electric materials; Thermoelectric performance; Thermoelectric properties; Thermoelectric semiconductor
Fields of Research (2008): 02 Physical Sciences > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
51 PHYSICAL SCIENCES > 5104 Condensed matter physics > 510404 Electronic and magnetic properties of condensed matter; superconductivity
Funding Details:
Identification Number or DOI: https://doi.org/10.1021/jacs.9b13272
URI: http://eprints.usq.edu.au/id/eprint/40553

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